15.8 - Sliding Filament Mechanism Flashcards
The structure of myosin and actin Changes in the sarcomere during muscle contraction The sliding filament theory Muscle relaxation The ATP-creatine phosphate system for providing energy
1
Q
What is the structure of myosin?
A
Globular head
2
Q
What is the structure of actin?
A
Myosin head attachment sites
3
Q
What happens to the sarcomere during muscle contraction?
A
I band and H-zone shorten
4
Q
What is the sliding filament theory?
A
Explains muscle contraction at molecular level
5
Q
What are the steps in the sliding filament theory?
A
Ca2+ moves tropomyosin
6
Q
How does muscle relaxation occur?
A
Ca2+ returns to sarcoplasmic reticulum
7
Q
What are the energy sources for muscle contraction?
A
Aerobic respiration
8
Q
What is aerobic respiration used for?
A
Prolonged
9
Q
What is anaerobic respiration used for?
A
Short
10
Q
What is the ATP-creatine phosphate system used for?
A
Short bursts of vigorous exercise
